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350 SD/SDL
Some engines had a design defect[7] which causes ovaling of cylinder walls, 
bent rods, excessive oil consumption (1 quart per 200 miles or one litre per 
300 kilometres is not uncommon), and eventually engine failure. 
Mercedes-Benz did not accept responsibility for this defect, even when 
problems arose before warranty terms were met. Most of these engine failures 
have so-far occurred on vehicles driven under high load or city driving, 
while highway driven engines do not show signs of problems until many miles 
later, if at all. Fixing the problem can cost the owner more than $10,000 or 
8000